Is it cruel to make your pet wear clothes?

I sometimes buy clothes for my cats, and I make them wear them. However, I only put the clothes on them for less than 30 minutes because I know that clothes really make them uncomfortable. I live in a tropical country, and putting dresses on them will only raise their temperature more. Also, personifying animals too much can do more harm than good. They might have an identity crisis in a sense that they will no longer know what they should do as pets. My friend's dog has been personified so much that she cannot be trained anymore.